“Rachel Keen has spent the past half-decade working overtime behind the pop scenes – lending her songwriting skills to various megastars (Beyoncé, Ellie Goulding, Little Mix), and her cool, assured vocals to a series of house DJs (Jax Jones, Martin Solveig, Jonas Blue). Now, the south Londoner is making a concerted effort to reroute her talents into her own steadily blossoming solo career, with a r”